----- Original Message -----
From: "Mikael Abrahamsson" <swmike@swm.pp.se> To: "Jean-Francois Mezei" <jfmezei_nanog@vaxination.ca> Cc: Nanog@nanog.org Sent: Monday, November 21, 2016 2:53:41 AM Subject: Re: Voice channels (FTTH, DOCSIS, VoLTE)
On Mon, 21 Nov 2016, Jean-Francois Mezei wrote:
I need to verify some claims made by incumbents in Canada that VoLTE data travels on a totally separate channel between the phone and the antenna.
Typically it travels on another "bearer" compared to Internet traffic.
http://blog.3g4g.co.uk/2013/08/volte-bearers.html
Think of bearers as "tunnels" between the mobile core network and the device. They have a lot in common with ATM PVCs in that they can have different QoS characteristics. So the VoLTE bearer can have scheduling priorities that means it'll always be low-latency and highest priority, meaning it might work well when the "Internet" bearer does not.
That is congruent with my understanding of how cableco voice is provisioned; it has different rules WRT VoN -- specifically about 911 -- because the cable company segregates it and handles it differently (your cablemodem is expected to be tied to your service address -- or whatever terminal device does the voice). Cheers, -- jra -- Jay R. Ashworth Baylink jra@baylink.com Designer The Things I Think RFC 2100 Ashworth & Associates http://www.bcp38.info 2000 Land Rover DII St Petersburg FL USA BCP38: Ask For It By Name! +1 727 647 1274